2011/7/29 Pádraig Brady <[email protected]>: >>> Should ls -l be moddified to show something when file has immutable >>> (and friends) set? >> >> AFAICT lsattr, in e2fsprogs, only does a 'stat'(lib/e2p/fgetflags.c) and >> checks st_flags, which i can't see in the "man 2 stat"-man-page i have >> installed, but nonetheless that is what it appears to do. >> >> So assuming there are no incompatibilites between filesystems, the >> information appears to come "free" with the stat(s) that ls has to do >> anyway. (In the sense that there doesn't appear to any excessive >> overhead involved, especially no additional I/O). >> >> So i would say: definitly. > > `strace lsattr ...` shows it calls ioctl (...FS_IOC_GETFLAGS...) > So there would be overhead. > The output of ls is fairly constrained too for compat reasons. > > However these flags are not specific to ext2 so it would fit > quite well from that perspective. > It might be something we could add to the stat command at least?
Well, "ls" already displays information about POSIX ACLs by putting a "+" after the UNIX permission bits. Some other UNIXen (such as Mac OS X) seem to use an "@" character to indicate xattrs or other forks of a file, so perhaps it would not be too inappropriate to throw an "@" symbol on a file for ext3 immutable bits and such. The question is what to do if something has both ACLs and ext3 attributes; should it get both characters? Just one? Perhaps a unique character? I dunno... Just food for thought... Cheers, Kyle Moffett
